Interfacing this board through 96-way connector. This 96-way connector
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Evaluation Board 2.7V 5.25V, Micro Power, 8-Channel, kSPS, 12-Bit EVAL-AD7888CB
Interfacing this board through 96-way connector. This 96-way connector compatible with EVAL-CONTROL BOARD which also available from Analog Devices. External sockets provided AIN1-AIN8 inputs.
OPERATING AD7888 EVALUATION BOARD Power Supplies
Full-Featured Evaluation Board AD7888 EVAL-CONTROL BOARD Compatible Stand Alone Capability On-Board Analog Buffering Reference Various Linking Options Software Control Data Analysis when used with EVAL-CONTROL BOARD
When using this evaluation board with EVAL-CONTROL BOARD supplies provided from EVALCONTROL BOARD through connector. When using board stand alone unit external supplies must provided. This evaluation board seven power supply inputs: VDD, AGND, +12V, -12V, AGND, DVDD DGND. +5V/+3V must connected input supply AD7888 pin. +12V -12V used supply OP467 quad op-amps AD780 voltage reference. connected both AGND inputs. DVDD input used supply separate 74LS04 DGND input must tied Alternatively 74LS04 supplied from same AD7888 supply inserting LK15 supplies decoupled relevant ground plane with 10µF tantalum 0.1µF multilayer ceramic capacitors point where they enter board. supply pins AD7888, quad op-amps reference also decoupled AGND with 10µF tantalum 0.1µF ceramic capacitor. Extensive ground planes used this board minimize effect high frequency noise interference. There ground planes, AGND DGND. These connected location close AD7888.
INTRODUCTION
This Technical Note describes evaluation board AD7888, high speed, power, 12-bit that operates from single 5.25 power supply. AD7888 capable ksps throughput rate. input track-andhold acquires signal features single ended sampling scheme. AD7888 contains eight single-ended analog inputs, AIN1 through AIN8. analog input each these channels from VREF. part capable converting full power signals 2.5MHz. Full data AD7888 available AD7888 data sheet available from Analog Devices should consulted conjunction with this Technical Note when using Evaluation Board. On-board components include AD780 which programmable +2.5V ultra high precision bandgap reference, three OP467 quad op-amps 74LS04 inverting buffer. There various link options which explained detail page
FUNCTIONAL BLOCK DIAGRAM
Ain1 ilte Ain8 ilte
7888
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Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood. 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
EVAL-AD7888CB
LINK SWITCH OPTIONS
There link options which must required operating setup before using evaluation board. functions these options outlined below.
Link Function.
LK1-LK8
These link options used connect input analog buffers input sockets AIN1-AIN8 analog buffer inputs Agnd. used AIN1 buffer AIN8 buffer When these links position relevant socket tied input buffer. When these links position relevant buffer input tied Agnd. This link option controls program AD780 voltage reference. When this link "inserted" AD780 output voltage +3.0V. When this link "removed" AD780 output voltage +2.5V. This link selects bias-up circuit. When this link When this link When this link source reference voltage applied both AD7888 REFIN/OUT position output AD780 selected. position external reference applied socket, position AD7888 internal reference used.
LK10
LK11
This link used select termination input bias-up circuit. When this link "inserted" termination applied. When this link "removed" termination removed. This link selects source supply AD7888. from EVAL-CONTROL BOARD. When this link position must supplied from external source When this link position supplied from EVAL-CONTROL BOARD This link option used select source +12V supply position +12V supplied from EVAL-CONTROL BOARD through connector. position +12V supplied from external source through power connector, This link option used select source -12V supply. position -12V supplied from EVAL-CONTROL BOARD through connector. position -12V supplied from external source through power connector, This link selects source DVDD supply 74LS04 digital buffers. When this link "inserted" supplied from same power source supplying AD7888 pin. When this link "removed" power must supplied from external source power connector,
LK12
LK13
LK14
LK15
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EVAL-AD7888CB
SETUP CONDITIONS
Care should taken before applying power signals evaluation board ensure that link positions required operating mode. Table shows position which links when evaluation board sent out.
Table Initial Link Switch Positions
Link LK2-LK8 LK10 LK11 LK12 LK13 LK14 LK15
Position Removed Inserted Inserted
Function. AIN1 connected input relevant analog buffer. inputs AIN2 AIN8 analog buffers tied AGND. AD780 provide +2.5V reference. AD780 selected supply reference voltage AD7888. termination resistor applied input bias-up circuit. AD7888 supplied EVAL-CONTROL BOARD +12V supplied from EVAL-CONTROL BOARD -12V supplied from EVAL-CONTROL BOARD 74LS04 powered from same power source AD7888.
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EVALUATION BOARD INTERFACING Table 96-Way Connector Functions. ROWA ROWB ROWC
Interfacing evaluation board 96-way connector, used connect evaluation board EVALCONTROL BOARD other system. pinout connector shown Figure designations given Table
AVDD AVDD AVDD AGND -12V DGND AGND AGND AGND AGND AGND AGND DGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND +12V DGND AGND AGND AGND AGND AGND AGND DGND DGND DGND DGND DGND DGND DGND TFS0 DGND DGND RFS0 SCLK0
Figure Configuration 96-Way Connector,
96-Way Connector Description
Data Transmit Zero. This output connected AD7888. Data Receive Zero. This input connected DOUT AD7888 inverting buffers. Serial Clock Zero. This serial clock connected SCLK AD7888 inverting buffer. Transmit/Receive Frame Sync Zero. These outputs connected AD7888. Digital Ground. These pins connected digital ground plane evaluation board. allows user provide digital supply connector along with other digital signals. Analog Ground. These pins connected analog ground plane evaluation board. Analog Supply. These pins connected AD7888 LK12. +12V Supply. This connected supply line board LK13. -12V Supply. This line connected supply line board LK14.
SCLK0
TFSO/RFS0
DGND
AGND
AVDD
+12V -12V
Note unused pins 96-way connector shown.
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SOCKETS OPERATING WITH EVAL-CONTROL BOARD
There eleven input sockets relevant operation AD7888 this evaluation board. function these sockets outlined Table III.
Table III. Socket Functions
Socket AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8
Function Sub-Miniature Socket AIN1 channel. Sub-Miniature Socket AIN2 channel. Sub-Miniature Socket AIN3 channel. Sub-Miniature Socket AIN4 channel. Sub-Miniature Socket AIN5 channel. Sub-Miniature Socket AIN6 channel. Sub-Miniature Socket AIN7 channel. Sub-Miniature Socket AIN8 channel. Sub-Miniature Socket Analog input bias-up circuit. Sub-Miniature Socket Analog output from bias-up circuit. Sub-Miniature Socket external reference voltage input.
evaluation board operated stand-alone mode operated conjunction with EVAL-CONTROL BOARD. This EVAL-CONTROL BOARD available from Analog Devices under order entry "EVAL-CONTROL BOARD". When operated with this control board, supplies control signals operate AD7888 provided EVAL-CONTROL BOARD when under control AD7888 software which provided with AD7888 evaluation board package. This EVAL-CONTROL BOARD will also operate with Analog Devices evaluation boards which with letters their title. 96-way connector EVAL-AD7888CB plugs directly into 96-way connector EVAL-CONTROL BOARD. power supplies required system. EVAL-CONTROL BOARD generates required supplies itself EVAL-AD7888CB. EVAL-CONTROL BOARD powered from transformer. This standard transformer capable supplying current available accessory from Analog Devices under following part numbers: EVAL-110VAC-US: EVAL-220VAC-UK: EVAL-220VAC-EU: U.S. Japan U.K. Europe
These transformers also available other suppliers including Digikey (U.S.) Campbell Collins (U.K.). Connection between EVAL-CONTROL BOARD serial port standard RS-232 cable which provided part EVAL-CONTROL BOARD package. Please refer manual which accompanies EVAL-CONTROL BOARD more details EVALCONTROL BOARD package.
CONNECTORS
There four connectors AD7888 evaluation board outlined Table
Table Connector Functions
Connector
Function 96-Way Connector used interface EVALCONTROL BOARD External AGND power connector. External +12V, -12V AGND power connector. External DVDD DGND power connector.
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Figure Main Screen
SOFTWARE DESCRIPTION
Included EVAL-AD7888CB evaluation board package PC-compatible disk which contains software controlling evaluating performance AD7888 when operated with EVAL-CONTROL BOARD. EVAL-AD7888CB Demonstration/Evaluation Software runs under later requires minimum 386-based machine with 400kB base 500kB free hard disk space. user interface dedicated program written especially AD7888. disk which accompanies EVAL-AD7888CB contains several files. user should create directory main drive label this "AD7888". Then, files EVAL-AD7888CB disk should copied into this directory. Mouse Driver should enabled before running software. this been loaded, program will run. software, simply make AD7888 directory current directory type "go". When evaluation program starts, user sees screen shown Figure (without scope waveforms). This main screen divided into three parts. part provides main control interface AD7888 evaluation software. middle part main screen functions Digital Storage Oscilloscope bottom part main screen operates either Digital Spectrum Analyzer Histogram analyzer. Each part screen several buttons that pressed using mouse keyboard. press button using mouse, simply move on-screen pointer button activated click. keyboard, simply press appropriate highlighted button. Lower
case letters must used. When button pressed, highlighted screen. next button highlighted using previous button holding down shift together. highlighted button also pressed pressing space bar. Pressing halts operation currently progress. this document, button activated from keyboard then used shown bold button name. example, prog" highlighted bold, indicating that button activated pressing key. Some buttons have indicator. indicator button means that function associated with that button Absence indicator light means that function associated with button off. on/off status these buttons changed simply selecting button.
Setting EVAL-CONTROL BOARD
When software run, Setup" button left screen should selected setup menu (see fig. This menu sets EVAL-CONTROL BOARD with EVAL-AD7888CB. Firstly, configuration file must loaded. configuration file contains default configuration information EVAL-CONTROL BOARD, Digital Spectrum Analyzer Digital Storage Oscilloscope. also tells AD7888.EXE software which .HIP file download ADSP-2111. .HIP file contains code which executed ADSP-2111. Normally, prog" button off, when configuration file loaded, .HIP file automatically downloaded ADSP-2111. However, prog" button then .HIP file downloaded ADSP-2111. REV.
EVAL-AD7888CB
load configuration file, click "load" button screen. After configuration file loaded, sample rate number samples changed. nature software, maximum sampling rate allowed limited each operating mode. mode maximum sampling rate 68KHz mode mode 43KHz. mode operation only required, then sample rate increased maximum 100KHz with slight change software. Please contact GP.APPS@analog.com this information. Save. This saves samples file either later date with other software. samples saved either "volts", "ints" "binary". format these files ASCII text. Note that AD7888 software only load files saved "ints" format. Files saved "volts" "ints" formats used with packages such Mathcad. Files saved "binary" format viewing purposes only. Load. This allows user load data from file with .DAT extension. Only data that saved ints loaded analyzed. configuration file must loaded Setup" menu before data file analyzed. there EVALCONTROL BOARD connected then prog" button Setup" menu must Once configuration file been loaded, data loaded from .DAT file analyzed according settings Setup" menu. Reset. Choosing this option resets EVAL-CONTROL BOARD. Quit. This quits AD7888 evaluation software returns control operating system.
F10:
INFORMATION WINDOWS
Figure Setup Menu Screen
analog input channel selected clicking required channel reference turned off/on clicking reference button. required mode operation selected clicking buttons "Power" section. Refer data sheet complete explanation these operational modes. "Analog section shows analog input range offset voltage. "Coding" section Unipolar default when configuration file loaded. should never Bipolar when evalualauting AD7888.
MAIN SCREEN
There three information windows main screen. left-hand window configuration window gives details about part being evaluated. shows name program that been downloaded EVALCONTROL BOARD, sampling frequency, number bits, analog input range part output code format part. right-hand large window Status window. This window provides feedback user what operations currently being performed software also displays error messages. Directly underneath status window small window that shows selected conversion sequence maximum minimum values most recently captured samples channels conversion sequence.
Test Mode
left part main screen contains eight buttons which selected using mouse using function keys from keyboard. These buttons actions they perform are: Info. This button shows information software. Setup. This button activates setup menu. Samp. When this pressed, software causes AD7888 perform number conversions determined setup menu (see above). data from these conversions then analyzed AD7888 evaluation software. Another samples taken pressing again. Cont. Pressing this button causes software repeatedly perform conversions analyze them. Once conversions analysis been done samples, software automatically repeats process. continues this until pressed.
right main screen Test Mode buttons. These buttons determine what sort testing done samples captured software. Both analysis analysis performed. function these buttons are: plot Choosing this button causes Digital Spectrum Analyzer appear bottom screen. Histogram: Choosing this button causes Histogram Analyzer displayed bottom screen. There other button near screen, beside "F10 Quit" button. This blackman-harris: When performing Fourier transform sampled data, this button determines whether data windowed blackman-harris window before transform. When this button data windowed. When this button off, data isn't windowed. Digital Spectrum Analyzer section more details.
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EVAL-AD7888CB
DIGITAL STORAGE OSCILLOSCOPE.
When samples data captured, they displayed Digital Storage Oscilloscope. blackman-harris button turned then windowed data also displayed oscilloscope. 'scope been designed similar conventional oscilloscope. right oscilloscope several buttons that control manner which data displayed 'scope. timebase oscilloscope automatically chosen software Time/Div "Auto" button user also select timebase clicking Time/Div window scrolling down through possible timebases. Similarly, vertical scale oscilloscope chosen automatically Volt/Div "Auto" button user also option selecting desired vertical scale similar manner selecting timebase. other buttons associated with oscilloscope are: grid This button toggles grid display oscilloscope off. axis This button toggles axis display oscilloscope text This button toggles text displayed oscilloscope screen off. line When line button displayed samples joined together lines. When this button off, samples displayed points. When this button component sampled signal removed signal displayed. This effect centering signal vertically oscilloscope screen. When this button off, component
dual
moved signal displayed with horizontal axis corresponding code display option useful zooming lowlevel signal that large offset. When "dual" button oscilloscope screen divided into parts with sampled data display centered horizontal axis windowed data display centered another. When "dual" button off, both traces centered same horizontal axis. This button toggles sampled data trace off. This button toggles windowed data trace off.
HISTOGRAM ANALYZER
histogram analyzer counts number occurrences each code captured samples displays histogram these counts. most frequently occurring code displayed center histogram. analyzer normally used with input signal calculates mean standard deviation sampled data. mean standard deviation displayed both volts units size converter. histogram gives good indication noise performance ADC. standard deviation shows directly noise introduced conversion process. Each channel sequence viewed turn using channel select buttons right histogram screen
Figure Histogram Screen
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Figure AD7888 Evaluation Board Circuit Diagram
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EVAL-AD7888CB
Table AD7888 Evaluation Board Bill Materials
Item
Reference Designator
Description OP467 Quad op-amp AD7888 AD780 Voltage Reference 74LS04 invertor 10nF Capacitor (1206 case) 10uF Tantalum (TAJ-B Case) 0.1uf Ceramic (0603 Case)
Manuf/Dist Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Cannon Farrnell Farnell Farnell Farnell Farnell Farnell Farnell Farnell Farrnell Farnell
Part OP467GP AD7888BR AD780AN 373-450 578-320 498-737 499-675 499-687 498-798 499-225 237-024 543-070 339-635 339-179
1516 0.1uf Ceramic (0805 Case) AIN1-8 LK11 LK15 LK10 LK15 Each Corner 10uF Tantalum (TAJ-C Case) 10nF Ceramic (0805 case) 68pF Ceramic 0.25W 0.25W 0.1% 0.25W 0.1% SD103C Schottky Diode DIN41612 connector Terminal Block terminal Block Gold Jack link option link option link option Shorting Block Rubber Stick-on Feet Ultra Profile socket pins
225-393 151-785 151-786 310-682 511-705 511-780 511-780 150-410 148-922 519-959
-10-
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EVAL-AD7888CB
Figure Component Side Artwork
Figure Solder Side Artwork
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-11-
Figure AD7888 Evaluation Board Component Placement Drawing.
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